Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '257ef3abee0e65ec6b41c53080ae45af5a62afa593aa0536ac19127347c22c5f' 
  AND token = '9pnjTw0d5pQbE/GgCQuuIDEuaZatHa3cvlIDjiFTPBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}